EP0616324A2 - Appareil d'enregistrement et de reproduktion numérique - Google Patents

Appareil d'enregistrement et de reproduktion numérique Download PDF

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Publication number
EP0616324A2
EP0616324A2 EP94103481A EP94103481A EP0616324A2 EP 0616324 A2 EP0616324 A2 EP 0616324A2 EP 94103481 A EP94103481 A EP 94103481A EP 94103481 A EP94103481 A EP 94103481A EP 0616324 A2 EP0616324 A2 EP 0616324A2
Authority
EP
European Patent Office
Prior art keywords
recording
digital
converter
digital signal
reproducing device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94103481A
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German (de)
English (en)
Other versions
EP0616324A3 (fr
EP0616324B1 (fr
Inventor
Friedhelm Zucker
Christian Büchler
Dietmar Uhde
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of EP0616324A2 publication Critical patent/EP0616324A2/fr
Publication of EP0616324A3 publication Critical patent/EP0616324A3/fr
Application granted granted Critical
Publication of EP0616324B1 publication Critical patent/EP0616324B1/fr
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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements

Definitions

  • the invention relates to a method and an arrangement for digital recording and reproducing devices with a digital signal input for recording or converting digital signals having different sampling frequencies, such as, for example, MOD or DAT devices.
  • the sampling frequency with which an analog or digital signal is sampled is one of the most important system properties. It indicates how quickly the individual samples follow one another and is also referred to as the sampling rate or sampling frequency.
  • the sampling frequency is chosen at least twice as high as the frequency to be measured in accordance with Shannon's sampling theorem, which has been proven in practice. Audio signals in the frequency range up to 20 kHz would therefore require a sampling frequency of 40 kHz.
  • different sampling frequencies have been defined for the individual recording media and transmission methods.
  • the sampling frequency is: 44.1 kHz for the compact disc CD or mini disc, 48 kHz for digital audio tape DAT and 32 kHz for satellite broadcasting.
  • a sampling frequency converter is therefore required to process digital signals of a system with a first sampling frequency in a system with a second sampling frequency.
  • the sampling frequency conversion via an analog intermediate stage it is believed that it leads to quality losses and complex D / A and A / D converters required.
  • the intermediate analog stage and the multiple use of filters negate the essential advantages of digital signal processing, cf. KRIEG, Bernhard: Practice of digital audio technology. In: Franzis-Arbeitsbuch 1989, p.
  • analog transmission links have a lower dynamic compared to the digital transmission link and recording devices with analog signal input therefore usually have a modulation potentiometer or automatic modulation.
  • modulation control the constant readjustment leads to a loss of dynamics and the transmission is adversely affected by external signal interference.
  • the digital signal transmission which is almost insensitive to external signal interference, on the other hand requires a sampling rate converter or digital sampling frequency converter due to different sampling frequencies of recording and playback devices, in order to transfer from a DAT recorder to a MOD or mini disc or from a CD to a DAT recorder to make a digital signal.
  • the principle of linear interpolation used in digital sampling frequency or sampling rate conversion requires a known high expenditure.
  • the high outlay for realizing a digital sampling frequency converter results both from the ratio of the sampling rates and from the possible variants which require a reduction or an increase in the sampling frequency. Due to the effort required for a digital sampling frequency converter, some recording and reproducing devices only have a connection for analog signals which is also provided for recording information with a microphone. Since analog signal transmission has well-known disadvantages compared to digital signal transmission, digital signal transmission generally becomes preferred, especially if a digital signal source is available.
  • the invention is based on the fact that the A / D and D / A converter which is basically present is used in a special way in a digital recording and reproducing device to form a sampling frequency converter, so that without additional expenditure for a sampling frequency converter and without digital sampling frequency converter Sampling Rate Converter enables the recording or conversion of digital signals having different sampling frequencies via a digital signal input.
  • the D / A converter available for reproducing information in the recording and reproducing device is supplied with the digital signal differing from the sampling frequency used for recording in the recording and reproducing device and the output of the D / A converter with the input of the for information recording in Recording and playback device existing A / D converter connected via a filter adapted to the lowest sampling frequency.
  • the filter can be adapted to the lowest sampling frequency by switching over.
  • a connection between the usual way separate and generated reference voltages is provided in the D / A converter and in the A / D converter Determine the control range of the A / D or D / A converter.
  • Dynamic losses are avoided, in particular, by a reference voltage used jointly for the A / D and D / A converter and the matching of their modulation ranges thereby achieved.
  • the A / D and D / A converter can be integrated in the recording and reproducing device in the immediate vicinity or in a circuit, so that resistance to external signal interference can also be ensured.
  • the prejudice regarding the disadvantages of using an intermediate stage that processes analog signals cannot therefore be maintained.
  • Recording and reproducing devices can be realized which advantageously have a digital signal input for recording digital signals of different sampling frequencies and yet use an intermediate signal processing analog signal with a comparatively high quality of signal transmission and signal recording and require significantly less effort.
  • FIGS. 1 and 2 are used accordingly, so that they identify equivalent assemblies or properties.
  • the D / A converter 9 and A / D converter 5 generally present in a digital recording and reproducing device are advantageously used for recording digital signals of different sampling frequencies via a Digital signal input 1 used.
  • a conversion to the sampling rate or sampling frequency f2 is required.
  • Known digital recording and playback devices with a digital signal input have a sampling rate converter or sampling frequency converter 4 for this purpose corresponding to FIG.
  • AES Audio Engineering Society as a standardized digital interface.
  • the AES receiver 3 provides the sampling frequency converter 4 with the corresponding sampling frequency f1 or f2 or f3 of the digital signal at the digital signal input 1 and the assigned quantization signals, and the sampling frequency converter 4 then calculates the quantization values required for the special recording and reproducing device for the example selected here Sampling frequency f2, with which information signals supplied to an analog signal input 2 are also processed in the digital recording and reproducing device.
  • analog signals at the analog signal input 2 are fed via a potentiometer P influencing the modulation to an A / D converter 5, which provides a digital output signal with the sampling frequency f2 for recording.
  • a digital signal with the sampling frequency f2 is then fed to an encoder or a coding device 6 for recording on an information carrier 7 via a changeover switch S1.
  • the information carrier 7 is in a magneto-optical disk MOD in the selected example, but can also be a magnetic tape, the carrier of a transmitter signal or other carriers.
  • a decoder 8 is provided in the recording and reproducing device, which provides a digital output signal with the sampling frequency f2 to a D / A converter 9 via a changeover switch S2 for reproduction at the output 10.
  • output 10 is also a standard interface with a maximum output voltage of 0.775 volts.
  • the internal reference voltage source UR2 of the D / A converter 9 is coupled to the maximum input voltage value that is still to be resolved.
  • the switch S2 is provided in particular for listening in while recording.
  • the A / D converter 5 and the D / A converter 9 are each formed by an integrated circuit, each of which has an internal reference voltage source UR1 or UR2 for adaptation to a standardized input or output level, cf. Valvo Technical information on 871011, p.33; Sony circuit catalog for the CX20018 / CXA1144S or information sheet PDS-1084A for the PCM 1750 from Burr-Brown Corporation, Printed in USA December, 1990. They are used separately with their internal reference voltage sources in known recording and reproducing devices, cf. Block diagram for the R-DAT of type DTC-12000ES from Sony.
  • Fig.1 corresponding to the output of the Recording and playback device existing D / A converter 9 connected via a filter FI and a switch S3 to the input of the A / D converter 5.
  • the filter FI is adapted in a known manner to the lowest of the sampling frequencies f1, f2, f3 and can, if necessary, be made switchable as a function of the sampling frequency f1, f3 at the digital signal input 1.
  • a common reference voltage UR is used both for the A / D converter 5 and for the D / A converter 9, in order to ensure that the modulation ranges of the D / A converter 9 and the A / D converter 5 match.
  • the full control of the D / A converter 9 must correspond to the full control of the A / D converter 5.
  • Overmodulation of the A / D converter 5 is absolutely to be avoided due to signal distortions and information losses associated therewith, and understeering leads to dynamic losses.
  • internally formed reference voltage sources UR1 and UR2 could lead to a deviation between the modulation ranges, for example as a result of different drift, despite a previously not common match, a common reference voltage source UR is preferred in the embodiment.
  • the preferred embodiment of the A / D converter 5 and the D / A converter 9 is provided in a circuit.
  • the digital signal FIG. 1 is correspondingly fed via the AES receiver 3 forming the digital interface and the changeover switch S2 to the D / A converter 9, which is present in any case, and which also advantageously works with the existing A / D converter 5 forms a sampling frequency converter with an analog intermediate stage of special quality.
  • the application has been explained on the basis of recording and reproducing devices for audio signals, but the application can also be transferred to other digital signals and is not restricted to audio signals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Optical Communication System (AREA)
EP94103481A 1993-03-18 1994-03-08 Appareil et procédé d'enregistrement et de reproduction numérique Expired - Lifetime EP0616324B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4308617 1993-03-18
DE4308617A DE4308617A1 (de) 1993-03-18 1993-03-18 Digitales Aufzeichnungs- und Wiedergabegerät

Publications (3)

Publication Number Publication Date
EP0616324A2 true EP0616324A2 (fr) 1994-09-21
EP0616324A3 EP0616324A3 (fr) 1996-01-10
EP0616324B1 EP0616324B1 (fr) 1999-02-03

Family

ID=6483118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94103481A Expired - Lifetime EP0616324B1 (fr) 1993-03-18 1994-03-08 Appareil et procédé d'enregistrement et de reproduction numérique

Country Status (4)

Country Link
US (1) US5519395A (fr)
EP (1) EP0616324B1 (fr)
DE (2) DE4308617A1 (fr)
ES (1) ES2128448T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5818870A (en) * 1990-08-28 1998-10-06 Canon Kabushiki Kaisha Digital communication device
JP3037582B2 (ja) * 1995-04-12 2000-04-24 シャープ株式会社 デジタルデータのバッファリング装置
US6233633B1 (en) * 1998-03-05 2001-05-15 Sony Corporation Data transfer between a computer and a digital storage device using a computer sound card to convert the processed digital data to analog form

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01253873A (ja) * 1988-03-31 1989-10-11 Matsushita Electric Ind Co Ltd ディジタル信号記録再生装置
JPH0244575A (ja) * 1988-08-05 1990-02-14 Matsushita Electric Ind Co Ltd ディジタル信号記録再生装置
GB2223876A (en) * 1988-08-23 1990-04-18 Samsung Electronics Co Ltd Multiple audio signal processing system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4682251A (en) * 1984-03-21 1987-07-21 Victor Company Of Japan, Ltd. Video signal reproducing apparatus having a noise reduction circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01253873A (ja) * 1988-03-31 1989-10-11 Matsushita Electric Ind Co Ltd ディジタル信号記録再生装置
JPH0244575A (ja) * 1988-08-05 1990-02-14 Matsushita Electric Ind Co Ltd ディジタル信号記録再生装置
GB2223876A (en) * 1988-08-23 1990-04-18 Samsung Electronics Co Ltd Multiple audio signal processing system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014 no. 001 (P-985) ,8.Januar 1990 & JP-A-01 253873 (MATSUSHITA ELECTRIC IND CO LTD) 11.Oktober 1989, *
PATENT ABSTRACTS OF JAPAN vol. 014 no. 207 (P-1043) ,26.April 1990 & JP-A-02 044575 (MATSUSHITA ELECTRIC IND CO LTD) 14.Februar 1990, *

Also Published As

Publication number Publication date
ES2128448T3 (es) 1999-05-16
DE59407755D1 (de) 1999-03-18
EP0616324A3 (fr) 1996-01-10
US5519395A (en) 1996-05-21
DE4308617A1 (de) 1994-09-22
EP0616324B1 (fr) 1999-02-03

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